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. 2018 Feb 2;10(2):142. doi: 10.3390/polym10020142

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Variations of (a) friction force and (b) friction coefficient and (c) on-load scratch depth of PEEK and CFRPEEK in progressive load nanoscratch tests with an initial load of 0.3 mN and a final load of 60 mN.